看，别人是怎么实现鹰眼的（C#版）！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;


using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Controls;
/*
* 鹰眼视图的简单实现，只是通过拖动鹰眼视图的区域实现在主视图中的显示：
*/ 
namespace OverView
{
public partial class MainForm : Form
{
#region "界面初始化"


public MainForm()
{
InitializeComponent();
}


private void MainForm_Load(object sender, EventArgs e)
{
try
{
string strFileName = Application.StartupPath + @"\数据\房地产策划信息系统.mxd";
//在数据视图中加载地图，供查询操作
if (axMapControl2.CheckMxFile(strFileName))
{
axMapControl2.LoadMxFile(strFileName);
}
else
{
MessageBox.Show("错误的数据路径：" + strFileName);
}
}
catch (Exception ex)
{
MessageBox.Show("Error01 in MainForm.cs" + ex.Message);
}
}


#endregion "界面初始化"


#region "鹰眼地图"


/* 实现功能：
* 1、鹰眼控件会根据主控件的视图范围生成一个来导航
* 2、在鹰眼控件里点击左键移动，红色距形框会跟着鼠标移动，主控件的视图范围会根据红色距形框位置而做出相应的移动
* 3、在鹰眼控件中可以通过按住鼠标右键来拖动，生成一个新的红色距形框，来导航 
* 实现步骤如下（通过多个例子综合而成，write by booker,2008.4.12
*/
//1.鹰眼地图资源载入
//当数据视图文档发生变化后，把文档加载到鹰眼视图的地图控件axMapControl1中
private void axMapControl2_OnMapReplaced(object sender, IMapControlEvents2_OnMapReplacedEvent e)
{
//加载地图文档到MapControl中
axMapControl1.LoadMxFile(axMapControl2.DocumentFilename, null, null);
//设置MapControl显示范围至数据的全局范围
axMapControl1.Extent = axMapControl1.FullExtent;
}


//2.绘制鹰眼矩形框
private void axMapControl2_OnExtentUpdated(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e)
{
// 得到新范围
IEnvelope pEnv = (IEnvelope)e.newEnvelope;
IGraphicsContainer pGra = axMapControl1.Map as IGraphicsContainer;
IActiveView pAv = pGra as IActiveView;
//在绘制前，清除鹰眼axMapControl1中的任何图形元素
pGra.DeleteAllElements();
IRectangleElement pRectangleEle = new RectangleElementClass();
IElement pEle = pRectangleEle as IElement;
pEle.Geometry = pEnv;
//设置鹰眼图中的红线框
IRgbColor pColor = new RgbColorClass();
pColor.Red = 255;
pColor.Green = 0;
pColor.Blue = 0;
pColor.Transparency = 255;
//产生一个线符号对象
ILineSymbol pOutline = new SimpleLineSymbolClass();
pOutline.Width = 2;
pOutline.Color = pColor;
//设置颜色属性
pColor = new RgbColorClass();
pColor.Red = 255;
pColor.Green = 0;
pColor.Blue = 0;
pColor.Transparency = 0;
//设置填充符号的属性
IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = pColor;
pFillSymbol.Outline = pOutline;
IFillShapeElement pFillShapeEle = pEle as IFillShapeElement;
pFillShapeEle.Symbol = pFillSymbol;
pGra.AddElement((IElement)pFillShapeEle, 0);
//刷新
pAv.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}


//3. 实现互动
private void axMapControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)
{
/*
IPoint pPt = new PointClass();
pPt.PutCoords(e.mapX, e.mapY);
//改变主控件的视图范围
axMapControl2.CenterAt(pPt);
*/
if (e.button == 1)
{
IPoint pPt = new PointClass();
pPt.X = e.mapX;
pPt.Y = e.mapY;
IEnvelope pEnvelope = this.axMapControl1.TrackRectangle();
this.axMapControl2.Extent = pEnvelope;
}
}


private void axMapControl1_OnMouseMove(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseMoveEvent e)
{
if (e.button == 1)
{
IPoint pPt = new PointClass();
pPt.X = e.mapX;
pPt.Y = e.mapY;
//
IEnvelope pEnvelope = this.axMapControl2.Extent as IEnvelope;
pEnvelope.CenterAt(pPt);
this.axMapControl2.Extent = pEnvelope;
}
}


#endregion "鹰眼地图"
}
}